CN111505760A - Light guide plate with uniform light emission - Google Patents
Light guide plate with uniform light emission Download PDFInfo
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- CN111505760A CN111505760A CN202010356413.9A CN202010356413A CN111505760A CN 111505760 A CN111505760 A CN 111505760A CN 202010356413 A CN202010356413 A CN 202010356413A CN 111505760 A CN111505760 A CN 111505760A
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- light
- guide plate
- light guide
- reflection
- lamps
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a light guide plate with uniform light emitting, which belongs to the field of illumination and comprises a light emitting surface, a reflecting surface and a plurality of peripheral side surfaces between the light emitting surface and the reflecting surface, wherein the peripheral side surfaces comprise light inlet surfaces, L ED lamps are arranged on the outer sides of the light inlet surfaces, a plurality of printing ink mesh points are arranged on the reflecting surface, a plurality of V-shaped grooves are arranged on the light inlet surfaces, and the V-shaped grooves can enable light rays emitted from L ED lamps to the light inlet surfaces to be diffused when entering the light guide plate, so that the uniformity of the light emitting from the light emitting surface is improved, the problem that the uniformity of the light emitting is improved by increasing the covering surface of a L ED lamp in the prior art is solved, and.
Description
Technical Field
The invention relates to an illumination structure, in particular to a light guide plate with uniform light emission.
Background
The light guide plate is manufactured by utilizing an optical acrylic or PC plate and then printing light guide points on the bottom surface of the optical acrylic plate by using laser engraving, V-shaped cross grid engraving and UV screen printing technologies by using a material with extremely high refractive index and no light absorption. The light guide plate can convert narrower light rays emitted from the side surface of the light guide plate into a larger and more uniform light-emitting surface, and the principle is as follows: when light irradiates to the light guide point from the side surface of the light guide plate, the light can be diffused towards all directions due to diffuse reflection, and the light reflected to the light-emitting surface from different directions loses the condition of total reflection and can be emitted from the light-emitting surface.
The light guide plate is characterized in that the length and the width of the light guide plate are far larger than the thickness of the light guide plate, so that a plurality of small L ED lamps are generally arranged on the side surface of the light guide plate to serve as light sources, in order to enable light emitted by L ED lamps to enter the light guide plate as much as possible and avoid energy loss, L ED lamps need to be close to the light inlet surface of the light guide plate as much as possible, therefore, more light enters the light guide plate just opposite to L ED lamps, less light enters the light guide plate at the interval part between two adjacent L ED lamps, even after the light enters the light guide plate through diffuse reflection of ink dots, uneven brightness is easily caused.
For example, in chinese patent document, "a 4mm ultra-thin L ED panel light guide plate", which is disclosed in CN202947080U and includes a light guide plate and optical ink dots, it is disadvantageous that, when light is incident on the side surface of the light guide plate through L ED lamps, L ED lamps need to cover the whole light inlet surface as much as possible, otherwise dark stripes are easily formed on the formed light surface, resulting in a large number of L ED lamps and a large total power.
Disclosure of Invention
The invention provides a light guide plate with uniform light emitting, aiming at overcoming the problems that in the prior art, light rays emitted from a L ED lamp cannot be effectively diffused in all directions by a light guide plate, so that a L ED lamp is required to cover the whole light inlet surface as much as possible, and the required L ED lamps are more in number and larger in total power.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a light guide plate with uniform light emitting, which comprises a light emitting surface, a reflecting surface and a plurality of peripheral side surfaces between the light emitting surface and the reflecting surface, wherein the peripheral side surfaces comprise light inlet surfaces, L ED lamps are installed on the outer sides of the light inlet surfaces, a plurality of printing ink mesh points are arranged on the reflecting surface, a plurality of V-shaped grooves are arranged on the light inlet surfaces, the length direction of the V-shaped grooves is the same as the thickness direction of the light guide plate, and a plane incidence surface is arranged between every two adjacent V-shaped grooves.
Because the length and width of the light guide plate are far greater than the thickness of the light guide plate, a plurality of small L ED lamps are generally arranged on the side surface of the light guide plate to serve as a light source, in order to enable light emitted by L ED lamps to enter the light guide plate as much as possible and avoid energy loss, L ED lamps need to be close to the light inlet surface of the light guide plate as much as possible, therefore, more light enters the light guide plate at the part right opposite to L ED lamps, and less light enters the light guide plate at the part right opposite to the part between two adjacent L ED lamps, even after the diffuse reflection of ink dots is carried out, uneven brightness is easily caused, in the scheme, V-shaped grooves are arranged on the light inlet surface, when light enters from the light inlet surface, because the incident light is not perpendicular to the light inlet surface any more, the incident angle is between 0 and 90 degrees, the refraction angle is different from the size of the incident angle, the light direction is changed, the direction of the light incident from the two side surfaces of the V-shaped grooves is different, light nets of the light guide plate can be formed in the light guide plate, the positions where the light guide plate is not crossed, the light incident surface, the light is not deflected at the same direction, and the vertical direction, the position of the light incident surface, the light incident direction is not changed, the light incident direction, and the light incident direction is not changed, so that the light incident surface is not changed, the light incident surface is horizontal direction, the light incident surface.
Preferably, the reflection surface comprises a near lamp part and a far lamp part, the far lamp part is provided with a plurality of bumps for reducing the reflection angle of light, the printing ink lattice points are coated on the bumps, although diffuse reflection can enable the light to be emitted from all directions during reflection, the diffuse reflection still follows the reflection law of light, the incident angle of the light on the printing ink lattice points at the position far away from the L ED lamp is large, the reflection angle is also large, the light is easily reflected to the peripheral side surface opposite to the light inlet surface instead of being directly reflected to the light outlet surface, so that the loss of the light energy is caused to a certain extent, the bumps can reduce the reflection angle of the light, so that the light is easily and directly reflected to the light outlet surface, so that the loss of the light energy is reduced, the direction of the printing ink lattice points can be controlled by controlling the inclined direction of the outer side surface of the bumps, so that the reflection angle is changed, for example, the end, close to the light inlet surface, of the bump is thickened, can enable the surface where the printing ink lattice points to.
Preferably, the far light part is provided with a plurality of grooves for reducing the reflection angle of light, the ink dots are coated in the convex grooves, although the diffuse reflection can enable the light to be emitted from all directions during reflection, the diffuse reflection still follows the reflection law of light, the incident angle of the light on the ink dots at the far position from the L ED light is larger, the reflection angle is also larger, the light is easily reflected to the peripheral side surface opposite to the light entering surface rather than directly reflected to the light emitting surface, so that the loss of the light energy is caused to a certain extent, the reflection angle of the light can be reduced by the grooves, so that the light is easily and directly reflected to the light emitting surface, the loss of the light energy is reduced, the direction of the ink dots can be controlled by controlling the inclined direction of the bottom surfaces of the grooves, so that the reflection angle is changed, for example, the end of the groove far away from the light entering surface is deepened, so that the surface where the ink dots are positioned faces the light emitting surface, so that the reflection angle is reduced.
Preferably, the reflection surface comprises a reflection band, the reflection band is positioned on the reflection surface and close to the light inlet surface, the reflection band is provided with a reflection layer for reflecting light rays emitted from the inner side of the light guide plate to the outside, when the light rays emitted from the L ED lamp are emitted to the reflection surface far away from the light inlet surface, the light rays are totally reflected at the junction of the air and the light guide plate because the refractive index of the light guide plate is larger than that of the air, so that the light rays cannot leave the light guide plate, the light rays can directly leak from the reflection surface because the incidence angle is larger at the position close to the light inlet surface, and the light rays can be remained in the light guide plate by arranging the reflection layer on the reflection band, so that the energy loss is reduced, and the integral attractiveness of the device is improved.
Preferably, the width of the reflection band is not less than 0.9 times the thickness of the light guide plate; the light guide plate is made of organic glass, the refractive index of the light guide plate is about 1.5, and according to a calculation formula of the refraction angle, the total reflection of light can be calculated when the incident angle is greater than about 42 degrees, so that the width of the reflection band is not less than 0.9 time of the thickness of the light guide plate, and the light can be ensured to be completely remained in the light guide plate.
Preferably, the peripheral side surface is provided with a light reflecting layer for reflecting light rays emitted from the inner side of the light guide plate to the outside; the light reflecting layer on the peripheral side surface can prevent light from leaking from the peripheral side surface, so that energy loss is reduced, and the attractiveness of the device during illumination is improved.
Preferably, a peripheral side surface facing the light entrance surface is inclined in a direction toward the reflection surface; part of horizontally incident light irradiates the peripheral side face opposite to the light inlet face through the light guide plate, the side face inclines towards the direction of the reflecting face, so that the light can be prevented from being reflected back along the original path, the light energy loss is increased, the light outlet quantity on the light outlet face far away from the light inlet face can be compensated to a certain degree, and the integral light outlet of the light outlet face is more uniform; if the inclined direction directly faces the light emitting surface, the transmitted light is not dispersed enough, the uniformity is not high, and therefore the direction is set to face the reflecting surface, so that the light is transmitted out after diffuse reflection.
Preferably, a diffusion plate is arranged on the light emitting surface; the diffusion plate can further improve the uniformity of light emission, so that the device is more attractive in illumination.
Preferably, the L ED lamp comprises a pair of main lamps and a pair of auxiliary lamps, wherein the main lamps are symmetrical with the light inlet surfaces in the thickness direction of the light guide plate, the power of the main lamps is greater than that of the auxiliary lamps, the light guide plate has a brightness adjusting function, the light guide plate is at low brightness when only the auxiliary lamps are turned on, the light guide plate is at medium brightness when only the main lamps are turned on, and the light guide plate is at high brightness when the main lamps and the auxiliary lamps are turned on simultaneously, for a common light guide plate, the reduction of the number of the L ED lamps greatly reduces the uniformity of light emitted from the light outlet surface, so that dark stripes are generated on the light outlet surface, and only one pair of symmetrical L ED lamps in the scheme can form a cross-distributed light net in the light guide plate, so that the light outlet surface has better uniformity, and the brightness adjusting effect is better.
Therefore, the LED lamp has the advantages that (1) on the premise that L ED lamps are used in a small number, light emitted from the light emitting surface can be more uniform, so that cost is saved and product quality is improved, (2) on the premise that light loss is not increased, the light emitting quantity at a position far away from the light entering surface can be increased, so that the uniformity of the light emitting surface is improved, (3) light can be prevented from leaking from the side surface except the light entering surface, loss of light energy is reduced, the attractiveness is improved, and (4) on the premise that the light emitting uniformity is not influenced, the adjustment of light emitting brightness can be realized.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a top view of a first embodiment of the present invention.
Fig. 3 is a front view of the first embodiment of the present invention.
Fig. 4 is an enlarged view of a portion of the L ED lamp of fig. 1 in accordance with an embodiment of the invention.
FIG. 5 is a schematic diagram of a light ray incident on a light incident surface according to an embodiment of the present invention.
Fig. 6 is a schematic view of light rays incident on a flat light entrance surface, as compared to fig. 5.
Fig. 7 is a simulation diagram of the light emitting effect of the light emitting surface according to the embodiment of the invention.
Fig. 8 is a simulation diagram of the light emitting effect of the light emitting surface of the conventional light guide plate with a flat light inlet surface, compared with fig. 7.
Fig. 9 is a front view of the second embodiment of the present invention.
In the figure, the LED light source comprises a light emitting surface 1, a light emitting surface 2, a reflecting surface 3, a peripheral side surface 4, a light inlet surface 5, L ED lamps 51, a main lamp 52, an auxiliary lamp 53, a warm light lamp 6, a V-shaped groove 7, ink dots 8, bumps 9, grooves 10, a PCB 11 and a diffusion plate.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
In an embodiment, as shown in fig. 1, 2, 3, 4, 5, and 7, a light guide plate with uniform light emission is made of organic glass (PMMA) and has a size of 100 × 3mm, and includes a light exit surface 1 facing a lower side and a reflection surface 2 facing an upper side, and further includes four peripheral side surfaces 3 between the light exit surface and the reflection surface, the peripheral side surfaces include a light entrance surface 4 located on a left side, 6 light inlet surfaces are installed on an outer side of the light entrance surface, L ED lamps 5 are fixed on a PCB 10, the L ED lamps have a distance of 0.25mm from a lamp surface to a light entrance surface, the 6L lamps include two main lamps 51, two sub-lamps 52, two warm lamps 53, the main lamps, the sub-lamps and the warm lamps are axially symmetric about a light entrance plane axis in a thickness direction of the light guide plate, the main lamps are light entrance surface with a power of 0.5w, the sub-lamps are light entrance surface, a plurality of black ink reflection surface, a plurality of black ink reflection surface, a reflection layer is provided with a reflection layer, a reflection layer is provided with a reflection layer, a reflection layer is provided with a reflection layer with a height of a reflection layer, a reflection layer is provided with a reflection layer, a reflection layer is provided with a reflection layer, a reflection.
The light incident on the light entrance surface is greater than 0 due to the presence of the V-shaped grooves, so that the light is refracted, so that the light that originally shines in parallel is scattered from two different directions, thereby forming a crossed network of light rays in the light guide plate.
When the LED lamp is used indoors, 4 brightness states can exist, namely a warm light state only in which a warm light lamp is turned on, a low brightness state only in which an auxiliary lamp is turned on, a medium brightness state only in which a main lamp is turned on, and a high brightness state in which all lamps are turned on simultaneously, a pair of symmetrically arranged L ED lamps can uniformly emit light on the light emitting surface, and therefore the light guide plate can also keep good uniformity when the light emitting surface is dark.
From a comparison of fig. 5 and 6, it can be seen that the presence of the V-grooves improves the divergence of the incoming light; it can be seen from a comparison between fig. 7 and fig. 8 that the light guide plate of the present embodiment has a significantly improved uniformity compared to the conventional light guide plate.
Example two:
as shown in fig. 9, the light guide plate with uniform light emission is different from the first embodiment in that the far light portion is not provided with the projection of the first embodiment, but is provided with a plurality of grooves 9 for reducing the light reflection angle, the ink dots are coated in the grooves, and the depth of the grooves gradually decreases from the position close to the light inlet surface to the position far away from the light inlet surface, so as to form an inclined surface inclined towards the light outlet surface; the inclination angle of the groove closer to the light entering surface is relatively smaller, and the inclination angle of the groove farther from the light entering surface is relatively larger.
Claims (9)
1. The utility model provides a light guide plate that light-emitting is even, includes goes out plain noodles and plane of reflection, still includes a plurality of week side between plain noodles and the plane of reflection, week side is including advancing the plain noodles, L ED lamp is installed in the outside of advancing the plain noodles, be equipped with a plurality of printing ink site on the plane of reflection, characterized by, be equipped with a plurality of V type grooves on advancing the plain noodles, the length direction in V type groove is the same with light guide plate thickness direction, be equipped with the plane-shooting face between two adjacent V type grooves.
2. The light guide plate of claim 1, wherein the reflecting surface comprises a near light portion and a far light portion, the far light portion has a plurality of bumps for reducing the reflection angle of light, and the ink dots are coated on the bumps.
3. The light guide plate of claim 1, wherein the reflecting surface comprises a near light portion and a far light portion, the far light portion has a plurality of grooves for reducing the reflection angle of light, and the ink dots are coated in the grooves.
4. The light guide plate of claim 1, wherein the reflective surface comprises reflective strips, the reflective strips are located on the reflective surface near the light inlet surface, and the reflective strips are provided with a reflective layer for reflecting light emitted from the light guide plate.
5. The light guide plate of claim 4, wherein the width of the reflection band is not less than 0.9 times the thickness of the light guide plate.
6. A light guide plate of claim 1, wherein the peripheral surface is provided with a light reflecting layer for reflecting light emitted from the inner side of the light guide plate.
7. The light guide plate of claim 6, wherein a peripheral side surface opposite to the light entrance surface is inclined toward the reflection surface.
8. The light guide plate according to any one of claims 1 to 7, wherein a diffuser is disposed on the light emitting surface.
9. The light guide plate of claim 1, wherein the L ED lamps include a main lamp having an axis symmetrical to the axis of symmetry of the light inlet surface in the thickness direction of the light guide plate and a sub-lamp having an axis symmetrical to the axis of symmetry of the light inlet surface in the thickness direction of the light guide plate, the main lamp having a higher power than the sub-lamps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356413.9A CN111505760B (en) | 2020-04-29 | 2020-04-29 | Light guide plate with uniform light emission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356413.9A CN111505760B (en) | 2020-04-29 | 2020-04-29 | Light guide plate with uniform light emission |
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| Publication Number | Publication Date |
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| CN111505760A true CN111505760A (en) | 2020-08-07 |
| CN111505760B CN111505760B (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010356413.9A Active CN111505760B (en) | 2020-04-29 | 2020-04-29 | Light guide plate with uniform light emission |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413469A (en) * | 2020-11-03 | 2021-02-26 | 浙江凯耀照明有限责任公司 | Side-lighting panel lamp |
| CN113217841A (en) * | 2021-04-15 | 2021-08-06 | 宁波凯耀电器制造有限公司 | Side-emitting lamp without light guide plate |
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| CN102943972A (en) * | 2011-08-15 | 2013-02-27 | 昆山顺景光电有限公司 | High-brightness yellow-green LED backlight source |
| US20140029305A1 (en) * | 2012-07-25 | 2014-01-30 | Zhi-Ting YE | Light source module |
| CN103712095A (en) * | 2012-10-02 | 2014-04-09 | 胜华科技股份有限公司 | lighting device |
| CN206906755U (en) * | 2017-05-11 | 2018-01-19 | 昆山龙腾光电有限公司 | Backlight module and display device |
| CN107664871A (en) * | 2016-07-27 | 2018-02-06 | 京东方科技集团股份有限公司 | A kind of backlight module and display device |
| CN108205169A (en) * | 2018-01-16 | 2018-06-26 | 滁州佳宏光电有限公司 | A kind of mobile phone light guide panel and its manufacturing method |
| CN210199344U (en) * | 2019-07-16 | 2020-03-27 | 东莞市元立电子科技有限公司 | Light guide plate for backlight source |
-
2020
- 2020-04-29 CN CN202010356413.9A patent/CN111505760B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943972A (en) * | 2011-08-15 | 2013-02-27 | 昆山顺景光电有限公司 | High-brightness yellow-green LED backlight source |
| US20140029305A1 (en) * | 2012-07-25 | 2014-01-30 | Zhi-Ting YE | Light source module |
| CN103712095A (en) * | 2012-10-02 | 2014-04-09 | 胜华科技股份有限公司 | lighting device |
| CN107664871A (en) * | 2016-07-27 | 2018-02-06 | 京东方科技集团股份有限公司 | A kind of backlight module and display device |
| CN206906755U (en) * | 2017-05-11 | 2018-01-19 | 昆山龙腾光电有限公司 | Backlight module and display device |
| CN108205169A (en) * | 2018-01-16 | 2018-06-26 | 滁州佳宏光电有限公司 | A kind of mobile phone light guide panel and its manufacturing method |
| CN210199344U (en) * | 2019-07-16 | 2020-03-27 | 东莞市元立电子科技有限公司 | Light guide plate for backlight source |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413469A (en) * | 2020-11-03 | 2021-02-26 | 浙江凯耀照明有限责任公司 | Side-lighting panel lamp |
| CN112413469B (en) * | 2020-11-03 | 2022-12-09 | 浙江凯耀照明有限责任公司 | Side-lighting panel lamp |
| CN113217841A (en) * | 2021-04-15 | 2021-08-06 | 宁波凯耀电器制造有限公司 | Side-emitting lamp without light guide plate |
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| Publication number | Publication date |
|---|---|
| CN111505760B (en) | 2022-07-08 |
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